Grinding machine



June 30, 1925 C. E. VAN NORMAN GRVIND'ING MACHINE Filed Oct. 6, 1921 2 Sheets-Sheet 1 INVENTOR M a? WWW ATTORNFYS.

June 31a, 1925. 1,544,287

C, E. VAN NORMAN GRINDING MACHINE Filed Oct. 6, 1921, 2 Sheets-Sheet 2 ATTORNEYS.

Patented June 30, 1925,

. sour-ran!) Tr s PATENT orriclz.

cH R EsE. VAN -NDRMAN, .or'sPRINenIELD, ,MAssncHu-snr'rs, AssIeNonmo I AN NORMAN MACHINE ,{IQO ,CQMBANY QFsBnINGEIELD, .MASSACHIISETZTS, a con- PQBA'IYIQN ormsswuvsw s- GRINDING MACHI E.

:Hampdenand State of l\lassachusetts,have

invented new and 1usefulilmprovements in Grinding Mach'1nes,of which the following v is a :speeification.

This invention relates'generally to improvements in machine'toolsaand moreparticularly to machines which embojdy the characteristics of both a grinder and a lathe. i

The inventionlis animproveinent on that disclosed in fU. S. .Letters Patent No. 1,445,-

- 875, granted'February-QO, 1923 onan invenmotor carried by one of the relatively -mov- "tion of Robert Wt Ellingham andlCharles E. Van Norman.

'Theobject of this invention is to provi'de, in amachine of the general class disclosed ,insaid patent, an'improve'd arrangement of the driving mechanism, whereby one electric .ablezheads 0f;the.machine is connected to drive both of'the rotary spindles in said heads,- cha-racteri-zedt by the 'use of a flexible shaft, or equivalent connectionyto drive the rotary spindle in the othenhead.

Qther- .features and advantages WVlllappear in the following description and in the illustrative embodiment of the invention in the-accompanying drawings,'in which;-

Fig. 1 is a front elevational view of a machine embodying the invention 'Fig; 2 is a top plan View thereof;

:Fig.v 3is aifragmentarytop plan View of i 'movement and transverse movement between the work-holder. -Both these i movements 'might be -e fiected'by movement of either 'oneof these heads or one movement'mightbe ac-- the wheel'trimmer.

-Fig; 4: is anenlarged end elevational view showing the speed-reduction mechanism and Application filed October '6, 1921. 4 Serial No. 505,893.

7 performed.

tion. l/Vith the particular arrangement chosen for-fthese hea'ds,-the-bed isof substantially rightangular shape in plan.

Supported from bed 15- are-two heads-16 and 17, one of which, as 16, willbe hereinafter refer-red to as "the wheel-head and the other.ofwhich, as'1'(, will be hereinafter referred to as the work-head. In each of these heads is mounted a rotatable spindle,-

=the spindles for-the heads 16 and l7'loeing designated at 18=and 19 "respectively. One

of these, spindles, as 18, carries a' suitable grinding wheel, such as 20, the size and shape of which -will,--of course, be varied according tothe nature of th'e work tojbe Provision is also made on the wheel-head '16 for the reception oflathe tools,-a socket 22 beingprovidednt' the forward end ofthe wheel-head to receive a tool-holder, which may be'clamped 'inplace by set screws '24:. The other spindle -19 is designed; to carry some suitable-device for supporting and driving the Work, hereinafter referred to as a work-holder. "'For certainclasscs of work, a tail stock26, carrying an ordinary dead center 2' 7,"is provi'dedto cooperate'with the work head 17 which then serves as a head stock, to sup- ;port the work on centers.

" The particularmanner of mounti-ng the heads 16 and 17 on base '15 is, according to complishedby'each. As an illustrative ex ample of one of many mountings, available, the work-head'l'? is carried on a bed or carriage-28which is mounted; to slide longitudinally on ways 29 on base15 and may be moved by any suitable" means, as" by means of a rotatable hand-wheel 80 and suitable intermediate; connections ,w'ell-understood the art. The wheel-head 16; is

-mounted;toslide onwaysBl in a direction trans-verse to the line of travel 'of carriage and may likewise be moved by any suitable mechanism, of which there has been exemplified a rotatable hand-wheel 32 whichthrough means Well-known in the art may move head .16 forfcross-feeding purposes.

Since the invention'is independent of the, particular means for moving the heads 1'6 and 17, they may beoperated in any suitable way appropriate for the purpose.

7 Aside from the provision for the two rela tivemovements above-described, it isdesirable according to some features of tlie invention, to provide, either in conjunction with .orindependent of them, an arrange- Thus, the latter, as shown, ismovable,- rela ment which will permit oscillation ofone of the heads,asfor example thewoi'k-liead17.

tively to its supportingcarriage 28, about a vertical stud 33, and may be adj-usted to various positionsof angular adjustment by "end of .stud 33.

bring the axis of the work-holder at various angles to that ofthe wheel-carrying spindle The -head17 may be clamped in its a handlel-n'ut'36 threaded upon the upper The angular adjustability of head 17 permits all sorts of taper turn- I ingand grinding'and the head may equally well be mounted'for mechanical oscillation for 'the purpose of grinding curved surfaces, a full disclosure .of' mechanism for accomplishingthis result and the slight changes in :the mounting of the head being given in I reissued Letters Patent ofv the United'States No. 13,892 granted Marchf16, 1915 to CharlesE. Van Norman. Reference to this patent is-also made fora disclosure of a.

. means for automatically effecting the longipositions of adjustment by means of a handletudinal and transverse described. 8 r I The tail stock 26,-heretofore described, is mounted on the carriage 28 for longitudinal adjustment and may be clamped in various nut 37, .all in a manner which is analogous to the mounting of a tail stock in a,,,lathe and is too well known in the art to require I further description.

, ;In accordance'with this invention, one of the rotary spindlesin one ofthe movable shaft which will permit relative *movementv heads is driven from a suitable source of power through the intermediary of a flexible 7 between .the headand source in any, direction. 'Thus, as shown, the work-holder in itself is flexible, but also any intercon- 19 may be provided, as desired, to accomplish the result above described and by the term fiexibleshaftpas hereinafter used, is meant, not only a'co' ntinuousshaft which nectedparts or series of parts which include a provision for relat ve angular movement between [some of the connected parts and which will transmit power froina suitable source and at the same time permit relative movement between the sourceand the mem: ber to which the power is transmitted.

Preferably, although not necessarily, according to all features =of-the 111V6I1l3l01117l16 motor 38 is utilized to=drive the wheel-can rying spindle '18 and, to this end, the motor is shownas mounted for movement with the wheel head 16, as by being fastened thereto by' bolts 10. The heads of the latter preferably engage in T'-slots;,41 on head .16 to permit adjustment of the motor-on the head.

The. shaft42 of motor 38 carries a pulley sired speed-ratio between the motor and spindle. Otherpulleys,may, ofcourse, be suppliedwhich are interchangeable with' those described to effect otherspeed ratios so that grinding wheelsof various diameters may be driven at the proper'speeds; The mounting of motor 38 for movement-with the wheel head eliminates the usualvcom pensating 1 devices customarily employed to permit moveinent of the wheel-head without interruption in the continuity of. the drive. The elim nation ofthese devices does away with a number of'parts which. ordinarily travel at very high speed and t-llBG/llllllllfitlOl] of each suclrpartiiot only isv advantageous, in that itpmakes forsimplification of the machine, but also-because it' contributes toward the reduction. of'vib'ration, freedom from which is essential forprecise grinding;

Since motor 38,-if of'a' standard type, rotates at considerably higher speed thaii'that desired for the work holdenspindle 19, itis es- 3 sential to provide in the driving connections between the latter and the-motor speed reduction' mechanism and one suitable meclia-iiisni' 43 and a belt 44-- connects this pulleyto a 'pulley45 oni'the wheel-carrying spindle 18,

these pulleysbeingl designed to give the de lie for this purpose is shown in Figs. 3 and *1. r

As there shown, a worm gear 46 isfixed to spindle 19' and a. worm 47 is "provided to drive the gear. -The wormAT: isfixed ona" shaft 18 and the latter, ismounted in suitable bearings -.provided in a tubular housing 49 which, as shown, is fixed to'a casing 50 forming a housing for ge'ar46. This casing" 50'isdesirably mounted for adjustment on the work-head17, as shown-in Fig. l. Thus,

casing-50 which encompasses spindle 19,.is pivoted at one en'dtothedwork head by a stud 51 and atwthe other endlias as-lot v 52 through which acap screw53 passesforithe purpose of clamping thecasing to. the head in its various positions of adjustment. A screw 5 t threaded into casing projects into slot 52 and is designed to abut screw 53 to adjustably limit the upward movement of casing 50 and prevent the worm 47 and gear 46 from being improperly inter-meshed. By loosening screw 53, casing 50 will drop downwardly and disengage worm L7 from gear 46, so that the spindle 19 may be turned over by hand to facilitate the mounting of work in the work-holder or may be held stationary when desired, as when grinding the teeth of a reamer, and. then angularly adjusted by hand, as required.

It is also desirable that provision be made for changing the speed of the work-holder to secure proper surface speeds on work of varying diameters. To this end, a second shaft is mounted above casing 50 in a tubular upper housing 56 and in parallel relation with shaft 48. One end of the latter is connected to the corresponding end of shaft by intermeshing spur gears 57 and 58, such gears being removable from their shafts to permit others of different ratios to be substituted. The other ends of shafts IB and 55 are adapted for connection to the flexible shaft 39, the latter being connectible with the former when the change gears 57 and 58 are not desired and with the latter when such gears are to be used. As an illustrative example of one means of connect ing the flexible shaft 39 to either of the shafts L8 or 55, the stationary member of shaft 39,-its casing,-is' connected by a threaded coupling 59 to the end of either housing 49 or 56 and the rotatable element of the flexible shaft, indicated at 60, has a projection 61 which fits into aslot 62 formed in shafts 48 and 55. The connection of shaft to the shaft and easing of motor *8 may be effected in a similar manner.

For the purpose of trimming off the grinding wheel 20, whenever necessary or desired, a wheel-trimmer, consisting of a diamond point 81 fixed in a stem 82, is provided. The stem 82 is insertible into a socket 83 provided on the tail-stock 26 and projecting therefrom at right angles tothe axis of the dead center 27. A set screw 84 is provided to clamp stem 82 in its socket. To utilize this trimmer, the tail stock is moved on bed 28 into a position such that on movement of the latter the trimmer will traverse the wheel and the grinding wheel 20 is set in motion, the head 17 being moved by the means provided to feed the wheel to the trimmer.

The general operation of the machine is analogous to ordinary grinders and is too well understood to require description here.

The invention has been disclosed herein, in an embodiment at present preferred, for illustrative purposes, but the scope of the invention is defined by the appended claims rather than by the foregoing description.

\Vhat I claim is i r 1. In a grinding machine, a base, a work head and a wheel head mounted thereon for movement onerelatively to the other, rotary spindles journaled one in each ofsaid heads, a motor mounted to move with the wheel head, a pulley on one end of the motor shaft, driving connections from said pulley to the wheel head spindle, and driving connections including flexible means connecting the other end of the motor shaft and the work head spindle.

9.. In a grinding machine, a base, a work head and a wheel head mountedthereon for movement one relatively to the other, rotary spindles jomrnaled one in each of said heads, a motor mounted to move with the wheel head, a pulley on one end of the motor shaft, driving connections from said pulley to the wheel head spindle, and driving connections including flexible means and speed reduction mechanism connecting the other end of the motor shaft and the work head spindle.

3. In a grinding machine, a base, awork head and a wheel head mounted thereon for movement one relatively to the other, rotary spindles mounted one in each of said heads, a motor mounted to move with one of said heads, driving connections from said motor to each of said spindles, the driving connection to one of said spindles including flexible means between the said motor and spindle. v

t. In. a grinding machine, a base, a work head and a wheel head mounted thereon for movement one relatively to the other, rotary spindles journaled one in each of said heads, a motor mounted to move with one of aid heads, driving connections from said motor to each of said spindles, the driving connections to the work head spindle including flexible means and speed reduction mechanism between said motor and spindle.

In testimonywhereof I have affixed my signature.

CHARLES E. VAN NORMAN. 

